In Jainism there isn’t a single fixed prayer destined specifically for the act of scattering ashes. The traditional emphasis after death is on the peaceful release of the soul and the family’s remembrance of the departed, rather than on any particular ritual that must be recited at that moment.

What is commonly done or recommended in Jain practice:

• Recite Namokar Mantra (Navkar Mantra): a universal, core prayer in Jainism praising the Arihants, Siddhas, and right conduct. It helps keep the focus on spiritual upliftment rather than on the body.
• Offer Shanti (peace) thoughts and mantras: simple prayers for the departed to attain tranquility and liberation, and to give the surviving ones strength and equanimity.
• Short prayers or mantras for liberation and welfare of all beings, such as universal peace sentiments, may be used.
• Keep the rite simple and non-ritualistic if that aligns with the family’s tradition; Jain funeral customs tend to be straightforward and focused on non-violence, detachment, and the soul’s liberation.

Notes on Digambar vs. Shwetambar:

• Both traditions value the same underlying aim—non-attachment, purification of karma, and liberation of the soul. The wording and emphasis of prayers can differ regionally or between families, but there isn’t a unique, required ash-scattering prayer that is exclusive to one sect.

If you’d like, I can provide the exact Sanskrit wording of Namokar Mantra and a few brief Shanti-type lines that are commonly used in Jain households. I can also help translate them into simple vernacular to fit a comforting moment for those present.